Vaping Harmless. Vape aerosol contains toxic chemicals like formaldehyde, arsenic, lead, chromium, and nickel. They damage lungs. They harm developing brains. They raise cancer risks. We E cigarette flavors are toxic to white blood cells, warn scientists Health Effects of Vaping Smoking and Tobacco Use CDC E cigarettes and Vaping Commercial Tobacco Use MN Dept. of Health New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking